1792 - The Columbia River was discovered by Captain Robert Gray.
1858 - Minnesota was admitted as the 32nd U.S. state.
1927 - The Academy of Motion Picture Arts and Sciences was founded.
1934 - A severe two-day dust storm stripped the topsoil from the great plains of the U.S. and created a "Dust Bowl." The storm was one of many.
1997 - Garry Kasparov, world chess champion, lost his first ever multi-game match. He lost to IBM's chess computer Deep Blue. It was the first time a computer had beat a world-champion player.
1998 - A French mint produced the first coins of Europe's single currency. The coin is known as the euro.
2001 - U.S. Attorney General John Ashcroft announced his decision to approve a 30-day delay of the execution of convicted Oklahoma City bomber Timothy McVeigh. McVeigh had been scheduled to be executed on May 16, 2001. The delay was because the Federal Bureau of Investigation (FBI) had failed to disclose thousands of documents to McVeigh's defense team.